Boiler



June 22,1926. 1,589,689

P. HEAY BOILE Filed Jan. 4?: 1922 l ooo o'o oo INVENTR Phulo HeyPatented June 22, 1926.

UNITED STATES 1,589,689 iaa'rEN'rA OFFICE.'y

` PI-IILLIP HEAY, OF VANCOUVER, BRITISH COLUMBIA, CANADA.

EOILER.

Application filed January My invention relates to improvements inboilers, with more particular rete-rence to those used in hot waterheating systems, although myl improvements may be applied to steamboilers also, and the object of my in vention is to provide a boiler ofsimple and strong construction in which the heatingsurface in relationto the water space and size of the boiler is very large so that it maybe constructed at a comparatively low cost and' o erated with createcono-m f and eilicienc 2:1

I attain these objects by the construction illustrated` in theaccompanying drawings in whichv Fig. 1 is a longitudinal sectionalelevation taken on the centre line of the boiler.

Fig. 2 is a cross sectional elevation'talren on the line 2-2 of Fig. 1.

Fig. 3 is a sectional plan view taken on the line 3-3 of Fig. 1.

-Fig. 4 is an outside end elevation of the boiler. V

Similar figures of reference indicate similar parts throughout theseveral views.

In construction the boiler may be rectangular withsquare ends or anyother aproved design, although in its preferred iorm, as illustrated,the ends are semi-circular.

The lower portion which in height is approximately half the height ofthe complete boiler consists of an outer shell, indicated generally bythe numeral 1, having the top plate 2, side plates 3 and 4, and the endplates 5 and 6, within which outer shell is arranged the firebox,indicated generally by the numeral 7 having the top plate 8, side plates9 and 10, and end plates 11 and 12, the lirebox being spaced from theouter shell so that a lower water chamber 13 is provided between theirebox and the shell and which extends around the top, sides and ends ofthe irebox, the bottom of this water chamber being closed by a mud ring14, all as shown in Figs. 1 and 2. The sides and ends of the irebox arestayed from the sides and ends of the outer shell by means of stays 15and the front half of the top plate 8 of the firebox is stayed kfrom thetop plate 2 of the shell by stays 16, while the rear haltl of the topplate 8 of the irebox is stayed from the top plate 2 of the shell bymeans of stay tubes 17, these stay tubes being pitched close togetherand preferably arranged in parallel rows, as shown in Figs. 1, 2 and 3.

18 indica-tes an intermediate water cham- 5, 1922`. Serial No. 527,188.

ber disposed above and spaced from the lower outer shell 1, this waterchamber being enclosed by spaced upper and lower plates 19 and 20respectively, the side plates 21 and 22 and the Iplates 23 and 24 andbeing supported from the outer shell 1 by the'side plates 25 and 26 andthe end plates 27 and 28,` which plates, besides supporting the waterchamber, also form a shell to enclosel .the space between the chamberand ,the outer shell 1 so that a combustion chamber 29. is formed, asshownin Figs. lfand 2. .The front halves of the plates 19 and 20 arestayed from each other by means of stay tubes 3'0 pitched close togetherand prefer-- ably arranged in parallel `rows while the rear halves ofthe plates are stayed from each other by stays 31, and between the low`-er water chamber 13 and thev intermediate one 18 extend vertical watertubes32 and 33, which water tubes are positioned adjacent the 'front andrear ends of the water chambers respectively and, extending through thecombustion chamber 29, establishcommuni-i cation between them. f

34 indicates an upper water'chamberdis- 'posed above and spaced from theintermediate water chamber 18, this water cham; ber being enclosed byspaced upper and low# erplates 35 and 36, the side plates 37 and 38,-and end plates 39 and 40 and being supported from the intermediatechamber 18 by the side plates 41 and 42 and end plates 43- and 44,whichyplates, besides supporting the water chamber 34,also form a shellto enclose the space between this chamber and the intermediate one sothat a combustion chamber or smoke chamber45 is `formed, as shown inFigs. 1 and 2. The *upper and lower plates of the water chamber 34 arestayed from each other by vertical stays 46 while the side plates 37 and38 are stayed from each other by transverse stays 47, and communicationis established between the upper and intermediate water chambersrespectively by vertical water tubes 48 and 49 positioned towards eachside of the chambers and a short distance in front of the transverseaxis of the boiler.

The rear end of the chamber 45 is provided with an opening 50 to whichthe lower It is-not-thought necessary to show or describe .the variousjoints throughout the boiler in detail as it will be readily understoodthat these arevinaccordance Awith the best practice "in V'boilerconstruction; it may be pointed out, however, that the designof theboiler is such that practically all the joints may be Welded or rivetedwith the utmost facility.

'In operation vthe flame, hot s, and smoke fromthe lirebox pass rupthrough the rearstaytubesxl 4into the rear end of the lower .combustion`chamber 29, travel forwardly therethr-oughgto pass up through the frontstay tubes 30 into the `fomard end of the Vupper combustion,chamber e5,through which they travel rearwardly and pass out through the opening Vinto the lchimney 51,*.as indicated bythe arrows in Fig. l. lVithreference therefore to i the ,lower -iaater chamber it `will' be seenthatthe lwater thereinis ,heated through Vaflarge area of heatingsurface :formedb-y the-area of thetog, side-:andL end plates forming thetirebozr. and the combined peripheral area ,of the stay tubes 17 which.pass'fthrough the water, to which zarearfshouldbe addeththat of the topplatebfthe shell 1,since'` this is heated by the :heatpassing through.the .combustion chamber 29,;so that the total area of-heating surfaceavailable for heating the vWater in the lower-chamberl vis very largeinconi-l parison with the ,amount of Watery contained in the chamber. Thisis also the case in the intermediate water chamber 18 the heatingsurfacearea available to heat the water therein being made up oftheareaofthe lower plate'QO whichfisheated by the hot gases passing,throughA the combustion chamber 29, theI combined,r peripheral area ofstay tubes 8O whichzpass through the water and are :heated by the gasespassing through them, and the area of thelupper plate 19, whichislieated by the gases asithey pass through the` upper combustionchamber 45. on their-'Way to-the chimney, thegases at the Sametimeheatingy theV lower plate 3G- ofA the upper :Water chamber 34 and alsothe water tubes .48 --and 49,-the vlower Vwater tubes and 33 being.heated by .the gases `in the lower combustion chamber, from all ofwhich `it will be seen that the utmost use is made .of the heat unitsbetween theliregrate and the chimney, thus ensuring great efficiency andeconomy in the operation of the boiler.

Vilhat I claim as my invention is A boiler comprising a fire box, ashell enclosing the fire box and spaced therefrom so as toprovideia-shallow water chamber above and atthe sides ofthe tire bo;;, asecond shell superposed on the first shelha Lsecond flat shallow waterchamber superposed 0n the second shell and ,composed of spaced plates,thelower of 1which "cooperates with the shell to provide a lowercon'ibustion chamber between the first andsecond .water chambers, athird-shell supe-rposed on the second `Water chamber, a third Waterchamber-superposed on the third shell composed of spaced plates, thevlower of which cooperates with the adjacent shell-to provide an uppercombustion chamber whichis positioned between the second iand thirdwater chamber, a plurality of vertical stay tubes extending through thefirst water chamber from the fire box to the y lower combustion chamberon the rea-risideofithetnansverse axis of the boiler, a pluralityofverticahstay tubes extending through `the second .water chamber from thelower combustion Ychamber to the uppercombustionchamber onthe frontsideof the transverse Kaxis ofthe boiler, stay bolts arrangedthroughtheremaining portionsv of the two Water chambers andalso through all of thethird water chamberwa tubular connection Vbetween lthe rear wend of thefirst water chamber and the second Water chamber,.a tubularconnectionbetween the front ends of said lirst andsecond water chambers,and a pair of tubular connections between the second and third water4chambers arranged on oppositeside ofthedongitudinal aXis of theboiler,.ashort distance in front of its transverseaxis.

In testimony whereof `affix `m'ytsignature atthe city of Vancouver, B.C., the y21st day of December, v1921.

AP HILLIP -HEAY

